19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which one of the following statements is not valid for oxoacids of phosphorous? (Manipal 2012)
When conc. H2SO4 is heated with P2O5 the acid is converted to (UP CPMT 2012)
Which of the following statements is correct for the iodine molecule?
All the halogens are coloured. The colours arise due to
Which one among the following is the most powerful oxidizing agent?
Which of the following halogens has only one oxidation state of –1 in an aqueous solution?
Which of the following elements can have both positive and negative oxidation states?
A gas that cannot be collected over water is
Standard sodium thiosulphate solution is used in the estimation of iodine present in a solution. The equivalent weight of sodium thiosulphate which is required to make the standard solution is
When SO2 gas is passed into an acidified solution of K2Cr2O7, the oxidation state of chromium changes
Which of the following ions does not have an S—S linkage?
H2SO4 is manufactured from SO2(g) by the
At room temperature, O3 is absorbed by
Ozone is an extremely powerful oxidizing agent. It is
Which of the following statements is correct?
Ozonized oxygen is a mixture of
Ozone is prepared by the action of silent electric discharge upon oxygen in an apparatus called ozonizer. The reaction
In ozone, the central oxygen atom uses
Which of the following has pπ – dπ bonding ? (a) NO (b) SO (c) BO (d) CO
The number of lone pairs and the number of S—S bonds in S8 molecules are respectively:
Which of the following statements regarding sulphur is incorrect?
The stability of the hydrides of oxygen, sulphur, selenium and tellurium decreases in the order
Oxygen is more electronegative than sulphur, yet H2S is acidic in nature while H2O is neutral because:
In which of the following species, S-atom assumes sp3 hybrid state? (I) SO3 (II) SO2 (III) H2S (IV) S8
Solid PCl5 exists as